New Hampshire Form 42 Application for Amended Certificate of Authority is a document used to amend the information on a company's Certificate of Authority. It is used to update information such as the company's name, address, registered agent, or officers. The form must be signed by all officers of the company and submitted with the appropriate fee to the New Hampshire Secretary of State. There are two types of New Hampshire Form 42 Application for Amended Certificate of Authority: Domestic Entity and Foreign Entity.